
par1  plasma temperature in keV 
par2  H density (cm 
par3  Metal abundances (He fixed at that defined by the abund command). The elements included are C, N, O, Ne, Na, Mg, Al, Si, S, Ar, Ca, Fe, Ni. Relative abundances are set by the abund command. 
par4  Redshift, z 
par5  Switch (0 = calculate, 1 = interpolate, 2 = interpolate using AtomDB data) 
norm  , where is the angular diameter distance to the source (cm), is the volume element (cm), and and are the electron and H densities (cm), respectively 
For the vmekal variant the parameters are as follows.
par1  plasma temperature in keV 
par2  H density (cm 
par3par16  Abundances for He, C, N, O, Ne, Na, Mg, Al, Si, S, Ar, Ca, Fe, Ni wrt Solar (defined by the abund command). 
par17  redshift, z 
par18  Switch (0 = calculate, 1 = interpolate, 2 = interpolate using AtomDB data) 
norm  , where is the angular diameter distance to the source (cm), is the volume element (cm), and and are the electron and H densities (cm), respectively 
The references for the meka model are as follows :
Mewe, Gronenschild & van den Oord (1985)
Mewe, Lemen, & van den Oord (1986)
Kaastra, J.S. 1992, An XRay Spectral Code for Optically Thin Plasmas
(Internal SRONLeiden Report, updated version 2.0)
Liedahl, Osterheld & Goldstein (1995)
Similar credit may also be given for the adopted ionization balance:
Arnaud & Rothenflug (1985)
Arnaud & Raymond (1992)
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